Combined speed and pressure governor.



No. 673,575. Patented May 7,. I90I. J, W. GARDNER.

COMBINED SPEED AND PRESSURE GOVERNOR.

(Application med Feb. 20, 1 901.)

. (llo Iodel.)

UNrran STATES JOHN WILLIS GARDNER, OF QUINCY, ILLINOIS.

COMBINED SPEED AND PRESSURE GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 673,5'75, dated May '7, 1901.

Application filed February 20, 1901. Serial No. 48,037. (No model.)

To f/.Z r11/1,0m, it 77mg/ con/cern:

Be it known that I, JOHN WILLIS GARDNER, of Quincy, in the county of Adams and State of Illinois, have invented certain new and useful Improvements in a Combined Speed and Pressure Governor; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this speciiication.

This invention relates to improvements in combined speed and pressure governors of that class shown in my prior United States Letters Patent, No. 638,412, granted December 5, 1899, and which 'are adapted to be applied to engines employed for operating aircompressors or other fluid-pu mps and so constructed and connected with the engine and the receiver into which the fluid is being pumped that the speed of the engine may be regulated to correspond with the pressure insaid receiver.

The present improvements are designed to improve the general construction and operation of governors of this character; and the invention consists in the matters hereinafter set forth, and more particularly pointed out in the appended claims.

In the drawings, Figure l is a side elevation of a combined speed and pressure governor made in accordance with my invention. Fig. 2 is a similar View, partly in section, with some of the parts in changed positions. Fig. 3 is a fragmentary sectional view on line 3 3 of Fig. 4. Fig. 4 is a fragmentary sectional view on line 4 4 of Fig. 2.

First referring to the general construction of the device, A designates a valve-chamber adapted to contain the usual governor-controlled throttle-valve. Said valve-cham ber supports a frame consisting of two rising laternor-spindle B4, connected with and actuated by said Weights in the usual manner. The shaft B2 is rotated through the medium ot' bevel gear-Wheels b b, one affixed to said shaft and the other to the inner end of a hori- Zontal rotative shaft B5, mounted in a bearing-sleeve formed on one of the frame members B and provided at its outer end with a belt wheel or pulley. C designates a short vertically-swinging lever which is pivoted between its ends to one of the rising frame mern bers B and extends inwardly and adapted for connection at its inner end with the governor-spindle, below the gear-Wheel thereon. The said lever O is herein shown as forked at its inner end, and the forked ends of the lever pass on opposite sides of a block or enlargement B6, attached to or formed on the lower end of the governor-spindle, and engage downwardlyfacing shoulders b2 thereon. Said lever is placed under the influence of a spring which resists the depression of the governor-spindle. As herein shown,the outer end of the lever is engaged by a spring-pressed device consisting of an endWise-movable rod D, which engages at its lower end said lever and bears downwardly thereon under the action of a spiral eXpansively-acting spring D', which surrounds said rod. Said rod passes at its upper end through a sleeve D2, which has screw-threaded engagement with a horizontal part b3 of the Aadjacent frame member B, said stud being provided at its upper end with a polygonal head for engagement by a Wrench. Said spring D is interposed between the sleeve D2 and an enlargement d at the lower end of the rod, whereby the tension of the spring may be varied to resist to a greater or less degree the action of the weights ment beingeifected by turning the screwthreaded sleeve inwardly and outwardly with respect to the frame. As herein shown, the block B is made separate from the governorspindle, being provided at its upper end with an upwardly-opening recess which receives the lower end ot' the spindle. end of the lever is forced constantly upward by the spring D the spindle and block need not be attached one to the other; but said spring D acts to hold said parts in their proper operative relation. The part of the frame B on which the lever C is mounted is 'to depress the governor-spindle, the adjust- As the inner IOO chambered to inclose the inner end of said lever and the spring-actuating device therefor.

Referring now to the parts constituting and associated with the pressure-governor, E designates a cylinder mounted on a ledge h4, consisting of a lateral extension of the upper wall of the valve-chamber. Said cylinder is adapted for communication with the fluid-receiver through a pipe e, leading` into the lower end of the cylinder. E designates a piston in said cylinder, provided with a stem which rises upwardly therefrom and passes through the' upper cylinder-head. F designates a lever.

which is pivoted between its ends to the same frame member with which the lever C is connected, said lever F being below and generally parallel with the lever C. The lever F engages at its inner end a head B7, attached to the upper end of the valve-spindle B8, and the opposite end of the lever is located over the piston-stem E2 and adapted to be engaged thereby Whenthe piston rises under the pressure of air entering said cylinder below the piston. The valve-stem is therefore depressed when the piston is elevated. As herein shown, said head Bl of the valve-spindle is provided with a laterally-open socket, and the adjacent end of the lever F is suitably formed to engage said socket. The upper end of the valvespindle is screw-threaded and engages a screwthreaded aperture in the lower end of the head, and the head is provided at its upper end with a short guide-stem b5, vwhich engages a guide-aperture in the lower end -of the block B6,connect.ed with the governor-spindle. Said Aguide connections are provided to maintain the parts in proper alinemcnt one with the y other. Said valve-spindle is returned to its normal uppermost position after the sam eh as been depressed by the pressure of air within the receiver in the manner described through the medium of a spring-actuated endwise-` movable rod G, which is supported in the adjacent frame member B and engages at its lower end the outer end of the valve-spindle y lever F. As herein shown, said rod passes at y its upper end through a sleeve B9, which has screw-threaded engagement with the horizontal vpart b3 of said frame member B, and a spiral eXpansively-actingspring G' is interposed between said sleeve and a head g on the lower end of said rod. The chainbered part of said frame member B, which contains the springpres'sed rod D, is made sufficiently large to contain said rod G and its actuating-spring.

In order that the pressure governor may not be operated under the infiuence of ordinary pressure within the receiver, resistance to the rise of the piston in the cylinder is provided, which consists in this instance of a levver H, -pivoted at its inner end to the stud f,

which connects the lever F to the frame and rests between its ends upon the upper end of F is located between said arms of the bifurcated lever. As a means of varying the initial pressure at which the pressure-governor is actuated the outer end of said lever is provided with a weight H, which is aflixed thereto through the medium of a hand-screw h.

In order to prevent the pressure-governor bringing the engine to a full stop, l have provided means for limiting the closing movement thereof before this condition is broughtabout. The means shown consists of ascrewthreaded bolt I, which is mounted inA a projecting part 226 of the frame member B above the-resistance-lever H and is adapted to be engaged at its lower end by said lever H when the latter is raised by 4pressure of air within the cylinder E. Said bolt having screwthreaded connection with the frame permits the minimum speed of the engine to be varied to suit different requirements, such variation being afforded by adjustment of the bolt toward and away from the lever H.

The operation of the device as constructed and described maybe briefly stated as follows: Fig. l shows the device at rest, with the weights l)3 in their lowermost positions and the piston Eoccupying the lower end of the cylinder rIfhe inner endsof the levers C and F are elevated b y the action of their springs D' G', whereby the valve-spindle and connected valve, as well as the governor-spindle, are in their raised Aor opened` positions. At this time also the resistance-lever H is rest-ing on the upperend of the piston-stem, together with the outer end of the lever F. If the speed-governor be 'brought intoo'peration by an excessive speed of theA engine, as shown in Fig. v2, the weights B3 will be raised and will act to depress lthe governorand valve spindle, the motion of theY governor-spindle being communicated to the ,valvespindle through the block B6, attached to the lower end of said governor-spindle,,and the head B7, connected to the -upper end ofthe valvespindle. The centrifugal weights are y elevated and the governor and valve spindles depressed against the force of the springs D and G, and upon the resumption of the normal speed of the engine the weights B3 fall and the valve-spindle is moved upwardly to I open the valve by the lever xF under the action of the spring G', the opening movement of said lever being 'limited by contactof its outer end with the upper end of the pistonstem.` The 'parts are so disposed that the head B'7 and the block B6 of the valve and governor spindles, respectively, are in Vcontact with each other when thegovernoiI is at rest, as shown in Fig. l, so that the valve will respond accurately and promptly to the action of the speed-governor.

The operation of the pressure-governor alone is as follows: Assuming that the parts are in a yposition shown in Fig. land the pressure of the air inthe cylinder E below the piston E' is sufficient toovercome the resistance exerted by the weighted lever H, the

IIO

IZO

piston rises and projects the stem upwardly through the cylinder-head. Said stem being in contact with both the lever H and the lever F, said levers are simultaneously raised. The elevation of the outer end of said lever F depresses the inner end thereof and the valve-spindle connected therewith. The depression of the valve-spindle by said. lever F does not, however, depress the governorspindle, as said parts have relatively vertical movement. The actions of the pressure and speed governors are therefore independent of each other, and both governors are constructed to quickly respond to the action of the engine and to the pressure within the receiver. The lever H and weight H', as before stated, are merely for the purpose of providing a convenient means for determining the initial pressure Within the receiver at which the pressure-governor shall act and may be made of other form.

It is obvious thatthe construction herein illustrated may be varied without departing from the spirit of my invention, and I do not Wish to be limited to such construction except as hereinafter made the subject of specitic claims.

I claim as my inventionl. A combined speed and pressure governor comprising, in combination with relatively endWise-movable governor and valve spindles, a spring applied to the governor-spindle to resist depression thereof, a duid-pressed part acting on the valve-spindle in a manner to depress the same, a spring acting in opposition to the duid-pressed part, and means for varying the tension of the governor-spindle spring.

2. A combined speed and pressure governor comprising, in combination with relatively endwise-movable governor and valve spindles, a spring applied to the governor-spindle to resist depression thereof, a duid-pressed part acting on the valve-spindle in a manner to depress the same, a spring acting in opposition to said fluid-pressed part and in conjunction with the governor-spindle spring, and means for varying the tension of the governor-spindle spring.

3. A combined speed and pressure governor comprising, in combination with relatively endwise-movable governor and valve spindles, a lever pivoted between its ends and connected at 011e end with the governor-spindle, a spring applied to the other end of said lever to depress the same, a second lever pivoted between its ends and connected at one end with the valve-spindle, a fluid-pressed part acting on said last-mentioned lever to depress the valve-spindle, a spring applied to said lever and acting` in opposition to said `fluid-pressed part and also in conjunction with the governor-spindle spring.

4. A combined speed and pressure governor comprising, in combination with relatively endwise-movable governor and valve spindles, a lever pivoted between its ends and connected at one end with the governor-spindle, a spring applied to the other end of said lever to depress the same, a second lever pivoted between its ends and connected at one end with the valve-spindle, a fluid-pressed part acting on said last-mentioned lever to depress the valve-spindle, a spring applied to said lever and acting in opposition to said iinid pressed part and also in conjunction with the governor-spindle spring, and means for varying the tension of said governor-spindle spring.

5. Acombined speed and pressure governor comprising, in combination with relatively endwise-movable governor and valve spindles, a lever pivoted between its ends and connected at one end with the governor-spindle, a spring applied tothe other end of said lever to depress the same, a second lever pivoted between its ends and connected at one end with the valve-spindle, a fluid-pressed part acting on said last-mentioned lever to depress the valve-spindle, a spring applied to said lever and acting in opposition to said fluid-pressed part and also in conjunction With the gove-rnor-spindle spring, and means for varying the 'minimum pressure at which said fluid-pressed part shall be actuated.

6. Acombined speed and pressure governor comprising, in combination with relatively endwise-movable governor and valve spindles and a governor-supporting frame, a lever c pivoted between its ends to said frame and connected at one end with said governor-spindle, a rod engaging the other end of said lever and having sliding engagement with the frame, a spring applied to said rod to depress the outer end of said lever, a second lever pivoted between its ends to said frame and connected at one end with the valve-spindle, a fluid-pressed part acting against the other end of said last-mentioned lever'in a manner to depress said valve-spindle, a rod engaging said lever, and having sliding engagement with the frame, and a spring applied to said rod and acting in opposition to the fluidpressed part,` and in conjunction with the governor-spindle spring.

7. A combined speed and pressure governor comprising, in combination with'relatively endwise-movable/governor and valve spin- IIO dles and a governor-supporti ng frame, a lever pivoted between its ends to saidr frame and connected at one end with said governor-spindle, a rod engaging the other end of said lever and having sliding engagement with the frame, a spring applied to said rod to depress the outer end of said lever, a second lever pivoted between its ends to said frame and connected at one end with the valve-spindle, a duid-pressed part acting against the other end of said last-mentioned lever in a manner to depress said valve-spindle, a rod engaging said lever, and having sliding engagement with the frame, a spring applied to said rod and acting in opposition to the fluid-pressed part, and in conjunction with the governorspindle spring, and means for varying the tension of the governor-spindle spring.

8. A combined speed and pressure governor eomprising,in combination with governor and valve spindles, one of said spindles being provided With 'a guide-stem which engages a socket in a part connected with the other spindle and permitting relative endWise movement of the spindles, a lever pivoted between its ends and connected at its inner end with the governor-spindle, a spring applied to the outer end of said lever and acting to resist depression of said spindle, a second lever pivoted between its ends and connected at its inner end With the valve-spindle, a fluid-pressed part acting on the outer end of the lever in a manner to depress the valvespindle, and a spring applied to said lastm'entioned lever, which acts in opposition to the fluid-pressed part and in 'conj unetion With the governor-spindle spring.

9. Acombined speed and pressure governor comprising, in combination with relatively endWise-movable governor and valve spin` dles, a spring applied to the 'governor-spi1`r dle in a manner to resist depression of the spindle, a lever pivot'ed between its ends and engaging at one end 'the valve-spindle, al Huid-pressed part acting 'on the other end of;

said'lever in a manner to depress the valvespindle, a spring applied to said lever and acting in opposition to said fluid-pressed part and also in conjunction with the governorspindle spring, and a Weight or its equivalent applied to said fluid-pressed part which acts in opposition to the fluid-pressure against said part.

10, A combine-d speed and pressure governor comprising, in combination With relatively endWise-movable governor and-valve spindles, a spring applied to the governor-spindle in a manner to resist depression'o'f Vsaid vspindle, a fluid-pressed part acting on the valvespindle in a manner to 'depress the same, a spring acting in opposition to the fluid-pressed part and in conjunction with the governorspindle spring, and an adjustable sto-p for limiting the movement of the Huid-pressed part which depresses the valve-spindle.

In testimony that I claim `the foregoing as my invention I afX my signature, in presence of two Witnesses, this 2d day of February, A. D. 1901.

J. WILLIS GARDNER.

Witnesses:

TAYLOR E. BROWN, WILLIAM L. HALL. 

